<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu :unique-opened="true" background-color="#333744"
        text-color="#fff" active-text-color="#409EFF"
        :collapse="isCollapse" :collapse-transition="false" router
        :default-active='activePath'>
          <!-- 一级菜单 -->
          <el-submenu :index='item.id + ""' v-for="item in menuList" :key='item.id'>
              <!-- 一级菜单的模板区域 -->
            <template slot="title">
                <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
             <el-menu-item :index="'/' + subItem.path +''" v-for="subItem in item.children" :key="subItem.id"
             @click="saveNavState('/' + subItem.path +'')">
                 <template slot="title">
                <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
             </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主题 -->
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    //  获取所有菜单
    async getMenuList () {
      const res = await this.$http.get('menus')
      if (res.data.meta.status !== 200) {
        this.$message.error(res.data.meta.msg)
      } else {
        this.menuList = res.data.data
      }
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home_container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
      border: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
    margin-right: 10px;
    font-size: 25px;
}
.toggle-button {
    background-color: #4A5064;
    color: white;
    font-size: 10px;
    line-height: 24px;
    text-align: center;
    letter-spacing: 0.5em;
    cursor:pointer;
}
</style>
